Also, let me add that music exchanged among Zunes will cease to play after three days or after it’s been played three times. This includes music, podcasts, and other files that are specifically licensed for unlimited reproduction or trading, such as music distributed under a Creative Commons license that doesn’t allow post-release encryption of the sort that Microsoft wraps around it for these transfers.

That’s an interesting observation: When the Zune adds DRM to Creative Commons licensed media files, it’s doing so in contravention of the license.